He served in the Legislative Assembly of Alberta from 1926 to 1930 as a member of the United Farmers caucus in government.

[2] Mihalcheon put his name forward to contest the nomination as the United Farmers candidate in the electoral district of Whitford in advance of the 1926 provincial election.

He defeated the sitting United Farmers MLA Mike Chornohus and two other contenders to be named the party's candidate in the 1926 Alberta general election.

His ability to speak English, Ukrainian, and Romanian was credited with helping him win the election.

[2] Mihalcheon retired from the Assembly at dissolution in 1930, when the Whitford UFA association asked him to step down fearing that his Romanian heritage might cause the party to lose the district.